High-Voltage Circuit Breakers

© Germany @ Russia © India @ China © USA © Mexico © Brazil Content Foreword Modular design Control Quenching principles Drive systems Development and routine testing Installation and commissioning Live tank circuit breakers Dead tank circuit breakers Dead Tank Compact Disconnecting Circuit Breaker Vacuum circuit breaker Circuit breaker accessories Customized products with the shortest delivery times from our global circuit breaker production network

Live tank circuit breakers Compact circuit breakers Circuit breakers from Siemens The availability of electric energy is vital for economic development and for quality of life. One of the necessary conditions for a reliable electric power supply is a well functioning transmission system. We are the only company worldwide that supports customers along the entire chain of energy conversion, with an efficient range of products, solutions and know-how for the transmission and distribution of electrical energy from one source. Circuit breakers are the central part of air-insulated (AIS) and gas-insulated...

3AP2 FI up to 550 kV All construction types consist of the same basic components: 3 Pillar 4 Control cabinet 5 Operating mechanism 3AP2/3 DT up to 550 kV Modular design Few basic components leading to a high diversity of types Siemens high-voltage circuit breakers, regardless of type or voltage range, are designed in a well proven modular platform concept. This leads to a high diversity of circuit breaker types and to high flexibility with regard to various applications according to our customers’ requirements. The main components, such as operating mechanism control system base frame kinematic...

4 Coupler 5 Moving pin 6 Nozzle 1 Contact carrier 2 Nozzle 7 Contact lamination 9 Heating cylinder 4 Main contact 5 Contact cylinder 10 Valve plate Closed position Opening: main contact Opening: arcing contact Open position Closed position Opening: main contact Opening: arcing contact Open position Quenching principles Our complete 3AP family up to 800 kV and above relies on our arc-quenching principles, either the self-compression or the dynamic self-compression principle using the thermal energy of the arc. Siemens patented this method for arc quenching in 1973 and has continued to develop...

1 Trip coil CLOSE 2 Cam plate 3 Corner gear 4 Connecting rod 5 Connecting rod for closing spring 6 Connecting rod for opening spring 7 Closing spring 8 Emergency hand crank 9 Charging gear 10 Charging shaft 11 Roller lever 12 Damper (for closing) 13 Operating shaft 14 Damper (for opening) 15 Trip coil OPEN 16 Drive mechanism housing 17 Opening spring 1 Hydraulic storage cylinder 2 Operating piston 3 Pilot valve 4 Main valve 5 Closing solenoid 6 Opening solenoid 7 Oil tank 8 Oil pump 9 Motor 10 Filter 11 Non-return valve 12 Pressure compensating valve 13 Safety valve 14 Pressure gauge 15 Pressure...

Quality right from the start Easy installation and commissioning Development The foundation of quality for Siemens high-voltage circuit breakers begins right in the development of a new product. Switching performance, high voltage stability and performance under normal mechanical loads (wind and short circuits) as well as seismic conditions are simulated and optimized in the outline design phase using computer-aided calculations. The use of parts and assembly units in a large number of breaker types such as live tank, dead tank, as well as GIS leads to a high volume standardization of the main...

Technical Data Rated short-circuit 80 breaking current [kA] 3AP live tank circuit breaker - the bestseller For applications from 72.5 kV up to 800 kV In contrast to dead tank circuit breakers, the interrupter unit in live tank breakers is not grounded during operation; it is exposed to high-voltage potential and therefore these circuit breakers are called live tanks. The 3AP circuit breaker family is available for rated voltages from 72.5 kV up to 800 kV. 3AP1 circuit breakers up to 300 kV are equipped with one interrupter unit per pole and 3AP2 circuit breakers up to 550 kV include two interrupter...

Rated short-circuit 80 breaking current [kA] 63 3AT live tank circuit breaker - the power pack Electrohydraulically operating circuit breaker for applications from 245 kV up to 800 kV In contrast to our 3AP series, 3AT circuit breakers are equipped with a hydraulic operating mechanism. Just like all of our circuit breaker types, it provides a high operating energy which safely controls even the highest switching voltages. It can master the most difficult switching duties such as breaking short-circuit currents in the shortest possible time. Its switching performance and the design of its interrupter...

Rated short-circuit 80 breaking current [kA] 3AP dead tank circuit breaker - the well grounded For applications from 72.5 kV up to 550 kV In contrast to live tank circuit breakers, dead tanks have a metal-enclosed interrupter unit, and the housing is always grounded. Therefore they are called dead tank circuit breakers. For certain substation designs, dead tank circuit breakers might be required instead of the standard live tank breakers. The dead tank breaker offers particular advantages if the protection design requires the use of several current transformers per pole assembly. Most important...

0. Possible components for the 3AP1 DTC compact switchgear 1. Bushing 2. Current transformer 3. Circuit breaker with self-compression principle 4. Three-positon disconnector / earthing switch 5. Voltage transformer 6. Cable connection assembly 7. High speed earthing switch Flexible solutions according to your substation configurations ■ Circuit breaker with one or three-pole operating mechanism ■ Disconnector, earthing switch, highspeed earthing switch ■ Current transformer, voltage transformer and voltage detection system ■ Cable connections possible at various positions ■ Bushings available...

Your advantages: ■ Highest reliability by applying well-proven and established components from Siemens circuit breakers and Ruhrtal earthing switches ■ Highest availability due to reduced maintenance interruptions ■ Costs and space saving solution by combining the circuit breaker and disconnector in one device ■ Minimized costs for transportation, maintenance, installation and commissioning as well as civil engineering (foundation, steel, cable ducts etc.) ■ Compact and intelligent interlocking and position indicating device ■ Optionally available with earthing switch (145 kV) ■ From one source...